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I just googled into the causes of crosstalk in serial data connections, and found: http://osd.com.au/serial-data-communications/ Interesting statement: " As an example of really poor practice, OSD once had a customer using a single twisted pair to carry transmit and receive data at about 9.6kbp...

This topic can be closed and marked [SOLVED]. The communication between the Opentherm Gateway and the Arduino is now stable for over a week . By choosing the right time slot for the transmissions from the Arduino, the communication is not affected, even if the cable is pretty long as in my case.

If you found the problems coincide with simultaneous serial transmission and reception, it may be due to cross-talk in the serial cable. I cannot check this. I can only check the characters as they are received by the laptop/Arduino, and I've never seen any garbage, nor noted any missing characters...

I think that I might have solved the problem. I changed the software in the Arduino to send its "PS=1" command ONLY after it has seen a full 'T-B' or 'T-R-B-A' OpenTherm message sequence, so I am making sure the command is NOT sent within the middle of such a sequence. Looking at the seria...

Thanks hvxl! Although your comment did not help me directly, it seems to have pointed me in the right direction. Indeed the upgrade to version 4.2.3 did not help. The communication was hanging again Saturday evening... I'm sorry if my post is long, but I'd like to share my findings of yesterday and ...

Just upgraded to gateway.hex version 4.2.3 (Feb 12, 2015). Maybe that helps. Keeping fingers crossed!

Since a few weeks I have an Opentherm gateway, which I use to control my boiler in co-operation with a heat pump inverter airco to heat up my house. The Opentherm gateway works fine, it is controlled by an Arduino UNO that uses serial communication to overrule the heating setpoint of the boiler whil...